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M. M. BOWERS. Detachable Plow Point.

No. 231,261. Patented Aug. 17,1880.

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UNITED STATES PATENT OFFICE.

MARCUS M. BOWERS, OF RICHMOND, VIRGINIA.

DETACHABLE PLOW-POINT.

SPECIFICATION forming part of Letters Patent No. 231,261, dated August17, 1880.

Application filed December 15, 1879.

To all whom it may concern Be it known that I, MARCUS M. BOWERS, ofRichmond, in the county of Henrico and State of Virginia, have inventedcertain new and useful Improvements in Detachable Plow-Points; and I dohereby declare that the following is a full, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to letters of reference markedthereon, which form a part of this specification.

Figure 1 is a vertical section of a share and point embodying myinvention, taken on line 00 as, Fig. 2. Fig. 2 is a bottom view. Fig. 3is a view of the point or slip detached. Fig. 4 is a vertical section,illustrating the manner of attaching my improved point to a share havinga left-hand mold-board.

My invention consists in an improvement upon the construction patentedto me July 20, 1875, whereby the application of a detachable slip to aplow in which the landside is inclined relative to the sole and point isgreatly facilitated,in order that such plows may have removable pointsapplied to them.

In the drawings, Ais the plowshare, which may be made of any usual orapproved form. B is the landside of the share, which, instead of beingarranged to run in a vertical plane, is constructed at an angle to thesole B and bottom of the furrow which the plow is intended to cut. Theforward end of the share is provided with an opening or socket, O, thesides or walls of which,instead of being vertical, as in my formerpatent, are situated in planes which are inclined to the sole or bottomof the furrow to be cut, their inclination being substantially the sameas that of the landside of the share. The side walls of the socket O inthe plowshare are formed to interlock with the sides of the shank of theslip to be hereinafter described 5 and for that purpose these sides ofthe socket may be constructed with central longitudinal grooves, c, toreceive a corresponding rib, c, on the shank of the slip; or these wallsof the socket may have projecting ribs, or their upper and lower edgesmay be beveled to fit the lips or flanges projecting from the upper andlower sides of the shank of the slip.

a a are key-seats formed in the side walls of the socket O to receive akey or keys.

D, Figs. 2 and 3, is a plow point or slip made in the form of anequal-sided wedge, and provided with a shank, E, the upper and lowerfaces of which are formed in extensions of the planes of the upper andlower sides, d 01 of the slip D.

In my former patent the sides of the shank occupy parallel planes atright angles to the upper and lower faces of the point, whereas in mypresent invention the sides c c of the shank occupy planes which havethe same inclination to the upper and lower faces of the point as do thesides of the socket 0. Thus it will be seen that the slip is reversiblein its supporting-socket, and also that, whichever side up the slip maybe, the point will have the same set or pitch relative to the share andto the sole or lower edge of the landside of the plow.

The front ends of the jaws of the socket G are beveled or ch amferedupon their outer sides, as at c 0 and the slip is provided withcorrespondingly-shaped recesses or seats 0 c at each side of the base ofthe shank,to fit closely the beveled ends cc so that when the slip isdrawn tightly to its place they support the jaws of the socket againstlateral strain, the slip being locked in this position by means of a keyor keys inserted in the key seats or notches formed for their receptionin the socket and in the shank.

It will, of course, be understood that that portion of the key-seat orkey-seats, when two are used, which is formed in the socket should be sorelated to the portion or portions formed in the shank as to give thekey or keys the requisite draft, in order that the shank may be drawnfirmly into place as the key or keys are driven in.

By examination of Fig. 4 it will be seen that forming the shank with itssides in planes at right angles to the horizontal planes of the upperand lower sides of the slip would be objectionable for two reasons:First, it would necessitate forming the socket in the forward end of theshare with vertical sides, as indicated in dotted lines, which wouldleave the metal at the lower edge of the left end or outside jaw of thesocket so thin and weak that it would be liable to be broken wheneverthe point came in contact with a stone or other equivalent obstruction;and, secondly, it would be impracticable to so shape the beveled ends 0c of the jaws of the socket and the corresponding recesses at the baseof the shank as to make these parts fit each other when the slip isreversed with the desired accuracy, it being apparent from anexamination of the drawings that a recess which would fit closely andsupport the upper edge of the jaw 0 would not properly fit and supportthe lower edge or corner of jaw c.

When the walls of the socket and the sides of the shank are made obliqueto the bottom of the share, as described, not only can the share be mademuch thicker and stronger on the land side, but, moreover, the point isheld more firmly in the socket by reason of the greatly increasedresistance against vertical strain or movement; whereas when the wallsof the socket and the sides of the shank are situated as shown in dottedlines, Fig. 4, the walls ofler no vertical resistance to assist inholding the point in place. Said dotted lines indicate the directions ofthe displacing tendencies, they being substantially at right angles tothe face d or face d of the point.

In order to facilitate casting the slip I construct the ribs on thesides of the shank with different bevels or inclined faces, as follows:By referring to Fig. 4 it will be seen that the faces 0 e present a lessobtuse angle to the adjacent faces of the shank E than do the faces :2 eto the faces of the shank adjacent to them, the advantage arising fromthis construction being that it enables the molder to use a patternwhich is divided on the line 2 Fig. 4, without havinga thin edge at oneside of each half of the pattern, as he would if the fices e e wereformed on the dotted lines y y,

The upper face of each rib is substantially parallel to the lower faceof the opposite rib, so that the point or slip, when reversed, shall fitthe socket as tightly as possible.

It will, of course, be understood that the edges of the slip are, bypreference, to be beveled to correspond with the inclination of thelandside.

What I claim is- 1. A detachable plow slip or point having a supportingshank with parallel sides, adapted to fit a corresponding socket in ashare, and formed with the plowing-faces (1 d which are arranged toalternately coincide with the bottom of the share, and are situatedobliquely to the parallel sides of the shank, substantially as setforth.

2. A plowshare having a horizontal sole, B, the landside B, inclined atan oblique angle to said sole, and a socket which extends entirelythrough the share, and has parallel lateral walls which are inclined atan oblique angle to the bottom or sole B, substantially as set forth.

3. A reversible plow point or slip having the faces d and d arranged toalternately coincide with the bottom of the share when attached, andhaving the shank E formed with the sides e c oblique to said faces (1 d,and with the ribs 6 each of which has its upper face and its lower faceinclined at different angles to the side of the shank, and has its upperface parallel to the lower face of the opposite rib, substantially asset forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

MARCUS M. BOWERS. Witnesses:

F. M. HILTZHIMER, Jr., HARRY TRINPER.

